The invention discloses an LTCC bandpass filter which adopts a feeding structure to suppress the third harmonic, including two quarter-wavelength resonators, two feeding patches and a floor, which are respectively distributed on nine conductor layers, Connected through metal vias; layers 1, 3, 6, and 9 are the floor, layers 2, 4, 5, and 7 are the layers where the quarter-wavelength resonators are located, and layer 8 is the layer where the feed patch is located ; By adjusting the distance between the eighth conductor layer and the ninth conductor layer, the impedance characteristics of the feed patch can be changed, thereby changing the coupling between the feed patch and the resonator; changing the length of the feed patch can also change The coupling between the feed patch and the resonator; adjusting the coupling of these two parts can make the feed patch and the resonator mismatch, thereby suppressing the third harmonic part of the filter characteristic of the resonator, and achieving the purpose of wide stopband; the present invention The adopted LTCC process contains a multi-layer structure, reduces the size of the filter, and has novelty, creativity and practicability.